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Acquisitions - Company's Pro Forma Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Basic net income per common share attributable to controlling interest:
Diluted (in dollars per share)	$ (0.56)us-gaap_EarningsPerShareDiluted	$ (0.28)us-gaap_EarningsPerShareDiluted
Basic (in dollars per share)	$ (0.56)us-gaap_EarningsPerShareBasic	$ (0.28)us-gaap_EarningsPerShareBasic
Revenues	$ 1,438.4us-gaap_Revenues	$ 1,510.0us-gaap_Revenues

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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